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' J. BATH GRINDING MACHINE original Filed June s, 1912 9 sheets-Sheet sNov. 3,1925. Re. 16,i6

K J. BATH n GRINDING' MACHINE l'omging Fifled Junes, 1912 9 sheets-sheet9 130 132 77 17.9 176 175" 175 I aal-Wm.'

Reiued Nov. 3, 1925.

cHUsET'rs.

To all 'whom t may concern.-

Be it known that I, JOHN BATH, a citizen of the Unit-ed States, residingat Worcester, county of Worcester, State of Massachusetts, have inventeda new and useful Grinding Machine, of which the following is aspecification.

This invention relates to grinding ma chinery, particularly tp machinesof that class designed to grind external surfaces of revolution.

The object of the invention is to produce a. machine for this purposehaving certain im rovements and refinements hereinafter fu y explainedand claimed by which to obtain more accurate results than heretofore incertain particulars, and to carry out the operations on the work piecein a more ethcient anda better manner. l

In the drawings accompanying this application, I have illustrated a formof the machine in which the principles of my invention are embodied, thesame containing the preferredform, though not necessarily the only one,*of this invention.

In these drawings, Figure -1 is a Aelevation of the machine referred to.

Fig. 2 is a rear elevation of the same. dFig. 3 is an elevation of theleft hand en gig. 4 is an elevation of the right hand en Fig. 5 is a lanview, the inding wheel being remove and the grin ng wheel post orsupport being shown in horizontal section.

` Fig. 6 is a plan view of the cross feed front slide of the machine andthe mechanism for operating the "moving parts, the work-carrying slidebeing removed, and part of the base of the machine being shown in plan.y' Fig. 7 is a sectional view of the cross feed operatin mechanism.

Fig. 8 is a ront elevation of the same.o

Fig. 8* is a perspective view of the same mechanism."

Fig. 9l is a cross section of the foot stock jand sliding swivel tableon line 9-9 of Fig. 10 is a longitudinal section enlarged of the`mechanism for reciprocating the swivel table.

l Re. 16,196

lUNrrED STATES PATENT, OFFICE.

- JOHN BATH, OF WORCESTER, MASSACHUSETTS, ASSGNOR TO JOITN BATH &COMPANY,

INCORPORATED, OF WORCESTER, MASSACHUSETTS, A

CORPORATION 0F MASSA- HummmI MACHINE.

i Original R0. 1,202,018, dated October 24, 1916, Serial No. 701,754,filled June 5, 1912. Application for reissue led lay 25, 1925. vSerialNo. 32,854.

Fig. 11 is a cross section on line 11-11 of' FigjlO. ig. 12 is a crosssection on of Fig. 10.

Fig. 13 is a perspective view of a cylindrical shell forming part of themechanism shown in Fig. 10.

Fig. 14 is a plan view of` a templet or logging element.

Fig. 15 is an elevation partly in section on line 15.15 of Fig. 6.

Fig. 16 is a cross section on line 16-16 of Fig. 6. l

Fig. 17 is an enlargement of the parts shown in Fig. '15.

une 12412 Fig. 18 is a cross section on line.18-18 of y Fig. 6.

Fig. 19 isla plan view of a slide showing the means of ad]usting swiveltable and means for carrying away the water.

Fig. 2O is a longitudinal section ofthe foot stock showing the means foradjusting the dead center.

Fig. 21 is a cross section onl part of the a larger scale y of one ofthe intermediate work rests.

Fig. 22 is a front elevation of the same. Fig. 23 is a side elevation ofthe same.

v Fig. 24 is a rear elevation of one of the water shields. Fig. 25 is aerspective view of one end ofthe swivel tab e showing the means which Ihave devised for displosing of the water.

Like reference c same parts in all the figures.

I will first describe the constructions illustrated in the drawings .andthen explain the principle embodied in suchconstructions and theadvantages thereof.

First referring 1 to6 inclusive, seen to a box like structure 1, plan ofwhich the L or rearwardly extending part 2 rises somewhat above the mainportion as a hollow column and supports a bracket 3 carrying thebearings 4 in which are mounted the spindle of the grinding wheel 5,.Such grinding wheel is partly covered and guarded by the case 6 securedto the bracket 3 and partially surroundingthe wheel. The forward part ofthe machine has transversely extending guide ways 7 and L-shaped in thelaracters indicate the rg (Eig 1,) on which is mounted a cross feed amanner which will The latter has longitudinal guide ways V10 and 11(Fig. 9) extending perpendicularly. of the cross feed guide ways, andtermed longitudinal because they extend in the direction in which thework is carried back and forth acrossfthe grinding wheel. The guide way10 is V- shaped and the guide way 1l is flat, the former receiving adownwardly projecting- V- shaped rib 12 on the under side of alongicarriage 9.

tudinal reciprocating slide 13 and the latter"- flat portion of theunder contacting with a side of the slide. .Such slide mayalso be termeda bed or a work carrier,` since its function is to carry the head stock14 (Fig. 1) and the foot stock 15 having, respectively, the live center16 and the dead center 17 engaged with the ends of the work. Both thehead and foot stocks are adjustably mounted on a swivel table connectedat its center with the slide 13, by means of a pivot stud 19 shown inFig. 19. The slide 13 contains a channel 20 in which is held a screw 21rotatable but otherwise.

immovable, passing through a nut 22 and having a head 23 at the front ofthe slide for manual actuation. The nut is adapted to travel along thechannel 20 and carries a stud or roll 24 contained in a notch 25 in oneend of the swivel table (Fig. 9). Rotation of the screw swings theswivel table in be readily understood, to enable tapered work pieces tobe ground. One or both ends of the swivel table has a projection 26(Figs. 5 and v25) bearing the index' mark 27 which in conjunction with agraduated scale on the adjacent part of the slide or bed shows theamount of deviation of the axis of the work from the line of travel.

The head and foot stocks are in the main 'of conventional design, eachhaving a groove to receive an upstanding V-shaped rib 28 extending thelength of the swivel table, shown in Fig. 9, and having also a bearingsurface 29 adapted to rest on a complementa] plane surface 30 extendingalong the swivel table at the opposite edge thereof from the rib. Thehead stock has rotatably mounted upon it a pulley 31 (Fig. 2) whichdrives, through gearing not shown. a spindle carrying the face plate 32and the live center 16. Such face plate also carries a pin or dog 33 asusual for rotating the work.

A cross section of the foot stock is shown in Fig. 9 and a longitudinalsection thereof in Fig. 20 (Sheet 1). The center 17 is secured, in theusual manner, in a tube or quill 34 whiohslides longitudinallyin asocket 35 and is prevented from rotating by a key or tongue 36 enteringa groove 37., An adjusting screw 38 has a bearing at 39 at one end ofthe foot stock and engages a nut 40 secured in the quill. It is rotatedin the usual 18 pivotally yof the disks,

' my invention but is Halse `Ina-finer by a hand wheel 41. A novel fea--ture of the -foot stock is that the screw is not held against endwisemovement in both directions. The means which normally holds the deadcenter up to the work is a spring 42 which thus takes the thrust of thework yieldingly rather than positively, and thereby insures against toogreat friction between the work-anddead center. A means, however, isprovided for=preventing the outward movement of the vscrew 38. that is,to the right "with respect to Figs. 1 and 20. This means is a set screw43 which is so arranged as [to-be capable of compressing a washeror plug44 of lead against theshank of.the screw and thereby holding the samewith any desired degree of friction. They foot stock is securedin anyposition of adjustment on the swivel table by means of abolt 45 (Fig. 9)having a head 46 contained in a T slot or under cut groove 47 extendinglongitudinally of the table, such bolt being tightened by a nut 48 asshown clearly in Fig. 9. A similar means ofwhich only thev nut 48 isshown in the dra-wings is used for' clamping the head stock."

The motor mechanism by which the slide is reciprocated to carry the workback and forth past the grinding wheel consists of the following. A'drive shaft 49 (Fig. 2) is driven by a belt 50 passing around a pulleyY51 on such shaft. Said shaft carries a bevel gear 52 which meshes with agear 53 on the side of a friction disk 54. This disk rotates about astationary shaft 55 suitably supported by brackets on one end of themachines base. Also rotatably mounted on thev same shaft are a frictiondisk 56, (Fig. 3) and a toothed drum or gear 57 whichl are rigidlyconnected together. The disks 54, 56 are somewhat separated and on theiradjacent faces are annular conca-ve grooves in which are containedwheels. or rolls 58 making contact with both disks for transmittingmotion from one to the other.. These rolls are adapted to oscillateabout axes perpendicular to their own axes and also to the axes tactwith the disks may tively, toward the center of one disk and toward theperiphery of the other disk at the same time, whereby to vary the speedof the .disk 56, 54 being driven at a uniform rate.

This particular driving mechanism is not described in a patent issuedyto-Hemy H. Cummings, therefore I Vdo not explain it in particulardetail. A feature of this mechanism. which is, however, novel with me.is that the shaft 55 is fixed and stationary while the disks tatingrolls 58 being pivotally supported upon brackets secured to the shaft.This condition enables the ball thrust bearingof the disk 54 to be takenup by lock nuts` 59 whereby their points of con-` be shifted, respecandthe gearv 57 rotate around it, the oscillating and rois on the shaftwith a worm wheel 77. The latter is on aV 'respectively opposite sidesof the shaft `55,

and to one of them is connected an upright shaft 60 (Fig. 3) by whichthe described oscillative movement is given. The other roll is operatedby said shaft through gear segments whereby the two rolls are eually andoppositely shifted. On the shaft 60 there is `connected an arm 61 havinga pivot coupling with a link 62 which passes from one side of the baseto the other and at its other end (see Fig. 4) carries a collar 63connected pivctally by a short link 64 with an arm 65 on an operatingshaft 66. The latter runs'upward beside the base to the top of thebracket 3, where it passes through a plate 67 and carries a handle 68pivoted to it at 69 above said plate. The handle may be turned in onedirection or the otherto shift the speed rolls through the connectionsdescribed, and is retained in any position by. a latch pin 70 carriedupon a rearwardly projecting arm 71 and adapted to be set into any oneof a number of holes in the disk 67. y

Gear 57 (Fig. 3) is longer than the amount of travel of the cross feedcarriage 9 and extends in the direction of this travel. It meshes withthe first' of a train of gears 72, 73, 74, and 75, `carried by an arm 76which is secured to the cross ifeed carriagel 9. Gear V72 may slidealong, while remainingin mesh with the long gear or drum 57, and thusdriving of the longitudinal Work feed (by the mechanism presently to bedescribed) is" made possible in all positions, of the carriage 9. Thelast'gear 75 of the train of a Worm '76 which meshes shaft which passesthrou h a transverse bearing 78 (see Fig. 6) an carries a bevel gear 79meshing with complemental bevel gears 80 and 81. The latter are pivotedlooselyupon a tubular shaft 82, for illust-ration of'which reference maybe had to Figs. 10 and 16, and therefore turn in respectively oppositedirections when the driving mech- 8'1 carry clutch members 83 and84,'respectively, on their ends nearest to one another, and betweenthese clutch elements is a double clutch sleeve 85 having teeth on both.

anism is in operation. These gears 80 'and element 83er the clutch 84.Thus either gear 80 or' 81'may drive the tubular shaft. The vmotion ofthis shaft is transmitted to the slide 13 bynieans of a pinion 90 drivenby the shaft and.connecting with a rack 91 (Fig.` 16) on the undersideof the slide. Said pinion 90 is loose on the tubular shaft but isconnected thereto with provision for a certain amount of rotative lostmotion by means of a cylindrical shell 92 (Fig. 10) securedto' a flange93 on the shaft and surrounding the hub 94 of the gear. Said hub Carriesa stud 95 contained in a slot 96 of the shell 92. The reversalsoftheshaft and shell 92 cause the pinion to drive the slide back and forthand at each reversal the lost motion allows the slide to remainstationary for af period before it too returns. pause is designed to belong enough to allow the work piece to make o-ne complete rotation whilethe grindingwheel is at the end of the part upon which it is acting. isa valuable feature as it enables the extreme endsl of the work to beground true and thus adds greatly to the accuracy of the machine. Theamount of lost motion may be varied to accommodate -Work pieces yofdifferent circumferential extents and to this end the shell 92 hasseveral slots 96 of varying lengths into any one of which the stud 95vmay be set, this stud being detachable for the' urpose substantially asshown.

T e rod 89 which shifts the clutch 85 may be operated first in onedirection and then in the other either automatically or by hand. Theyautomatic mechanism includes a lever 97 (see Figs. G, 15, and 17)pivoted upony a'shaft 98 in a box" 99 on the front of the cross feedslide. This lever carries a roll 100 (Fig. 17 contained in a notch 101ina bar 102 hich is adapted to slide endwise in a .guide 103 formedWithin the box having a removable cover 104. The bar 102 is alsoprovided with another notch 105 in which is containeda roll 106 on onearm of a bell crank lever 107 the other arm of which is forked and hastwo .prongs 108 straddling the rod 89 and carrying rolls 109 containedbetween collars 110 on said rod.

The rolls 109 are journaled upon studs 111 whichl are contained inSockets within the prongs 108, such sockets being split at one side andbeing closed upon the studs by clamp screws 112.

A novel feature of this mechanism consists in the inode in which thebell crankv 107 lis mounted, it being swiveled upon a stud 113 (Fig. 16)hanging from a bracket 114 at the rear side of the box 99. When Ithelever 97 is oscillated from one side to last described proendwisemovement shifting the clutch dogs for thus shiftbeing shown at 115 theother, the mechanism duces a corresponding of the rod 89, thereby 85.The slide 13 carries ing lever- 97, such dogs This This

and 116 (Fig. 1) and being conveniently pins screwed through holders 117which are hung by pivot'screws 118 (Fig. 23) to blocks 119 adjustablysecured by clamp bolts 120 having heads entering an undercutlongitudinal groove121 in the forward edge ot' the slide. Then intheirlnornial posit-ion the dogs travel in a path which contains thelever 97 and they are thus enabled to strike and swing said lever in onedirection or the other according as the slide is traveling. lVhen thebar 102 is thusmoved by this swing of the lever a V-shaped projection'122 (Fig. 17) on its under side travels over longitudinal mg gear. Atthe conclusion of a roll 123 carried by a plunger 124, depressing suchplunger against the resistance of a spring 125. lVhen the point of theprojection passes over the roll the spring causes pressure to be appliedto an inclined side of the projection causing the bar 102 yto completeits movement. I term this projection a V-faced cam on account of thefunction which it performs as described. Connection of the reversingclutch after disconnection of the clutch which was previously acting isj insured by this V-cam in connection with a certain amountof lostmotion provided between the Walls ofthe notch 105 and the roll 106. Thetravel of the Abar105 is greater than the total throw of the clutch 85and the extent of one face of the V-cam 1s about equal to this throw,while the lostmotion is 'approximately the same amount. Hence thedisconnection of the previously acting clutch is not completed until thepoint of the V-cam passes the center. Hence even though the slide'shouldstop at this point, the plunger acting on the side of the V willcontinue the movement of the clutch 85 until the same is coupled withthe reverse drivthis movement of the bar in either direction the excessspace in the notch 105 is entirely on that side of the roll 106 which isto be acted upon on the next throw of the bar. A novel feature isprovided in connection with the mounting of the plunger 124. (Fig. 17.)The same is contained 1n a sleeve 126 projecting from the bottom of thebox 99. It passes through a plug 127 having a flange 128 overlapping theend of the sleeve 126 and heldin place by screws 129. The shank of theplunger carries a key 130 contained in a groove in the plug to preventthe plung` er face of the roll 123 square with the V cam.

The means for manually operating the clutch consists of a lever 131(Figs. 16 and 18) pivoted to a pin 132 contained in an offset 133 of thedetachable front wall or cover 134 (Fig. 6) ofthe box 99 containing thereverse mechanism. Said lever passes through a slot 135 (Fig. 16) in thecover 136 of this box and has a handle on its outer end.

On its lower end beneaththe pivot is a. fork Ythreaded whereby saidcollars.

from turning and thereby to keep the posite sides of the rod 89 betweencollars 139 thereon.

The portion of the rod 89 which carries the collars 110 and 139 is whicharel made as nuts lit'ted into the threads of the rod, may be adjusted.The collars are split and are provided withu'hich they may be setimmovably in their respective positions. By so adjusting the collars.tbe levers 97 and 131 ma)v be brought into cert-ain desired positionswhen the clutch 85 is in the neutral position. A novel device forautomaticallyY arresting the clutch in neutral position and so stoppingthe travel of the slide is provided in a latch 140 Fig. 16) pivoted to abracket 141 on the cover 136. This latch has a notch 142 adapted toreceive a pin 143 on the side of the lever 131. In the constructionshown, the notch is formed between two lugs onthe under side of thelatch lever. and the outer faces of such lugs are cam shaped so that thepin will pass under' them and dis lace the lever until the notch isreached. 8rdinarily the latch 'lever is thrown back out of the way, butwhen the operator desires to stop the machine at the end of the nextcut, he swings it down allowing it to reston the pin 143.V On the nextreversal of the clutch mechanism when the lever 131 has reached theposition Where the notch may receive the pin such lever is locked andthe clutch is held in neutral position. A valuable feature of thisdevice is that the latch is gravity operated. to stop the trip motionand needs no springs for the purpose.

. The dog-operated trip 97 )asses through a slot in the box cover l136(Big. 5) and lies back of a rib 144 projecting upward from the coverbeside such slot. This. rib rises to the yheight of the end of the triplever and extends beyond each vlimit of movement thereof.l It isprovided for the triple purpose of concealing the lever, of clamping thesame, and of serving in conjunction therewith as an index or gage forshoulder work when the slide is *operated by hand. The manner in whichit accomplishes the first purpose is obvious. The second purpose isaccomplished b v a screw 145 shown in Fig.

lois

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When the work to be groundA is shouldered porting the work between theends thereof, and the dogs V115 and 116 have been set to one' of whichrests is shown lin Figs. 21, 22, correspond with these shoulders, theycoand 23. It consists of a casing 167 having act with the lever 97 'tostop the motion when a claw 168 (Fig. 21) adapted to enter an I the`shoulder has beenlfed up to the grinding undercut channel 169 at oneside of the T 70 wheel. Stop screws 1482 ig. 15) are proslot 47,previously mentioned. It also has a vided on both `sides of the lever 97to limit detachable clamp 17 0 with a rounded toe 171 the throw thereofwithin the etremities of entering a groove in the outer face of the ltheshield 144 and are adjustableto secuie swivel table at the fate of thelongitudinal l this end with exactness They are placed V rib"28. Thisclamp is secured bya screw 75 at a low point relatively to the pivot ofthe 172. Shoes 173 and 174 are provided for lever so that-,the noiseoccasioned by the Supporting the work, the former bearing leversti'ikinglthem will he deadened as much against the front side and thelatter against as ossible. 4 3 Y j the under side. The shoe 173 issecured by e cross feed byl means of which thev a screw 175 to a slide176 which travels 80 workis caused tov approach and recede fromvhorizontally inl the casing and is retained by the grinding wheel isaccomplished by a acover plate 177 which has a front wall 178 handxwheel149 (Figs. 6 and 7) secured upon containing a bearing for the adjustingscrew a cross screw 150 which-is held in a flange 179. vThe latter isthreaded into the slide bearing 151 between the two ball thrust bearandprojects through thewall 178, having 35 ings 152, 153 held in the frontwall of the -a collar 180 and a knob 181 fastened upon box 99. The crossscrew is threaded through it outside of the wall, and a collar 182 withanut 154 clamped to the top of the base 1. in the wall. The bottom shoeis carried by Between the hand wheel and the bearing 153 an arm 183,pvoted t0 the casing by a. pin j I have mounted on the cross screw anum- 184, having a Shoulder 185, An interme- 90 ber ofcollars 154, asman)T aS desired inde. diate lever 186 bears against the shoulderpendently keyed on the screw, each of which and is pressed upon by aslide 187 engaged forms a bearing for a stop finger 155 (Flg by asimilar screw 188 having a knob 189` 8) independent of one another. EachStop and an index collar 190.

finger cooperates with a stop awl 156 Fig. 21 shows clearly the mannerin which 95 mounted plvOtally 1119011 a Stud l5 PIOlCtrotation of thescrews 179 and 188 may adingv from a wing 158 which risesy from Jthejust the shoes to any relation with the work. flange of the bearing 151.EaehA 0f the StOP K The reason for providing a slide 187 instead pawlsis adapted t0 Swing Out of the v vy 0f of having the screw 188bearingvdirectly on the corresponding finger, but when 111 the the lever186 is that theE same direction of 1 00 path of the finger it iS heldrigidly by a prO- rotation of both knobs may have correspondject-ing lug159 which rests againsta st em ing effects on both shoes. The lever 186is 160 projectin from the arm 158 and having provided in order to give amore rigid abuta face 161. rhen swung out of the way, the ment for thearm which carries the shoe 174 stop pawl is Supported by a V Shoulder162 than would be provided if the slide 187 were 105 in the positionillustrated by the pawi 156 extended far enough to bear directly on thein Fig. 8. As many of the COOPeItlng StOP i arm 183 and the lever 186were omitted.

fingers and pawls can be lprovided aS may be It will be noted that theshoe 173 bears onv desired. They Serve t0 arrest the CIGSS feed the work0n the side opposite to that engaged at various points in duplicatingpieces havby the inding wheel, whereby the defiee- 110 ing anumber-ofdiameters t0 be IggrOllnd t0 tion of e work due to pressure of the wheell given sizesy or for varying diameters of is overcome, and that theshoe -174 supports roughing. and finishing cuts. The fingers the workagainst deilectionfduev to its weight may be adjusted into any angularposition and to thedownward thrust occasioned by j to suit the work' andto this end each 1S the friction of the grinding wheel.v There 115mounted upon a, ring 163 which Surrounds may be as many 0f these, restsas the length one of the collars 154l and is adapted to be andflexibility of the work piece requires,

tightened thereon by a clamp screw 164. three of them being shown inFigs. 1 5,

After the finger which is most advanced has and they maybe adjusted .toany points served its purpose, the cooperating stop pawl where theirpresence is required. 120

is swuno` out of `the way, leaving the next The formation of the swiveltable as above one rea to do Vits work. Secured tothe described, withthe grooves 169 and 171|, hub oft e hand wheel is a disk 165 (Fig. is afeature of great importance, as it en- 6) having a graduated scale onits periphery ables the rests tol be applied and removed near which liesa finger `166 (Fig. 8) on the with the utmost ease without necessitating125 end of the stem 160. This scale and index` removal of the work fromthe centers or in cooperation serve to denote the amount shifting of thehead stocker the foot stock.

of stock removed, and to correct the adjust- Between the head and footstocks and the ment of the stops 155. Y rests, I provide shields tocatch the water I have provided an improved rest for sup.- with whichthe grinding wheel and work 119 are deluged. `One of such shields holesy 206 secured is illustrated in detail in Figs. 23 and 24. It is made ofa sheet or plate 192, preferably of a thiclmess approximating that ofsheet iron, or at any rate relatively very thin, having a cylindricalcurvature and provided vwith a foot or lug 193 adapted to enter the-T-Slot 147 in the swivel table whereby to sup-J port and position thesheet. These shields are of stand ard length and as the spaces betweenthe various parts mentioned. Where two or more are required in one spacetheirslight thickness enables them to be overlapped at the edges.`Preferably also the casings of the rests have curved ribs 194 (Fig.`23) to underlie the adjacent ends of the shield. These shields preventthe water from s attering beyond the front of the swivel tab of thewateraway from the table, for they extend beyond 'the rear edge thereof asshown lin Fig. 23 and. discharge the water into a gutter or trough 195running along the rear side of'the slide13. From this gutter, which hasa Wide outlet at the rear, the water pours intoa pan 196 (Fig. 3)extending over the `base at the slide and having an extension 197 at oneend, as shown 1n Fig. 5. The relatively great length of the outlet from'the gutter, which outlet extends between the points "a and b, shown inFig. 5. and` the correspond-A ingly great length of the pan which under`1n the travel of,

ies this outlet at all points the slide, allows a rapid and completedischarge of the water from the gutter.. An

- outlet 198 is provided in the pan over .a tank 199 at the rear of thebase, and. in the tank is a pump 200 which "forces the Water through apipe 201 to a nozzlei202 (Figi 3) adjacent to the point which engagesthe work. The samewater .is thus used over and over again.,

AComplete provision is made for catching and conducting back any waterlwhich may escape past the shieldsL 192 and lodge on `the surface of theswivel tablel 18.` Any wateres-t 3 caping' in this manner is allowed toiow into the T slot 47 from which two large holes near the ends, or moreif desired','extend to the under side of the table 18. One Lof these isindicated by dotted lines at 203 in Fig. 23.` In the upper face oftheslide 13 beneath the swivel table arev several `capacious transversechannels 204 shown in Figs.

19 and 23 which lead to the `gutter, 195.

Such of the water as might flow to the ex' treme endsof the swivel tableis caught in pockets 205 formed in detachable end ieces These pocketsdischarge into the trough 195. remarked at this point that the carry theindex lingers 26 previway ample prof It may be pieces 206 ouslymentioned. In this many of them may be used'as may be required to occupy@At the ends of theslide e and conduct the greater part rear of the ofthe grinding wneelf 'direction in AJwhich this bight extends,

to the table as shown in Fig. 25.

lanes f vision is made for conducting all the water back to the tankandvpreventing any of it escaping outside-of the machine. Thearrangement of. thechannels 204 prevents the accumulation of pressurebetween the slide and table which would cause anywater thus accumulatedto spurt out at the ends thereof. As the channels are discontinuous andare separated by ribs of the slide which "eitend entirelyto the bottomof the swivel table. the utmost impedance is put in the way of endwiseilow ofthe water while the greatest `freedom is given for its flow intothe' gutter. 13 are plates 207 (Figs. 1 and 25) having lapping lips209`on the ends of the swivel table, and abuttingagainst lips 210 on`the end. .pieces 206. The abutting flanges 208 and 210 arecomplementally curved, one being concave and the otherconvex, aboutthecentei` ofthe swivel 19. "graduation marks 211 26 serves as index.- .Iwill nowdescribe the means for driving the grinding wheel and work andthe spe= cial advantages ment, of means v have already mentioned Athepower belt which comes rounds `the pulley 51 on the drive shaft 49(Figs. 2 and 4). This belt'is guided around an idlexpulley 212 which"allows it toy run from a countershat almost directly over the machineand causes it to surround the greater part Aof the pulley 51. 0n theshaft 49 `on the opposite side of the J the base fromthe pulley 51 is acone pulley 213 from which a belt 214 passes over a complementa] conepulley 215 on theupwith which the finger per part of the L. rIhe latterpulley is fixed to a, shaft 216 passing through the L on which is apulley V217. The latter and two guide the' L,

and around them passes belt 220 which also flanges 208 over.;A

The flange 208 bears n of ,the particular, arrangewhich I/have adopted.I

passes around a pulley 221 se`v from a counter-shaft and sur` L-portionor post pulleys 218 and 219 Vare all within` lll] cured to theigrindingwheel spindle and contained between the bearings on the bracket over thepulleys 217 and 221 and" under the pulley 219, while the` lower stretchpasses under the pulley 218. The pulley 219 is so situated as to makeabight in the upper stretch 'ofxthe belt and is adjustable in themounted upon a stud. 222 `clamped in a guide way 22S-in the base. Asythe^base elzltceptf for' an `opening t e adjustably the y side of 224 atthe rear and guide slot 223, I have provided a novel sary position.yThlsmeans comprises ribs fcastin the base and passing from one sidemeans 'forgplacing the belt 220-in thenecesofthe Lto the 'otherand so`arranged as toA guide the belt properly around the several pulleys whenit is fed in. One of the ribs being iis entirely linclosed Y' The upperstretchfof the belt 220 passes lthat stretch of the `pulley 225 passesfrom a'. point in front of the pulley 217 downward .and to the rear ofthe guide roll 219. Thesecond rib 226 passes from a point above and intherear of the guide roll, under the same and upward toward the spindleulley 221, terminating` close to the rear side thereof. The third rib227 lies slightly below and parallel to belt passing from the '221'tothe guide roll 218 and is carried around beneath the latter roll.Finally there is a rib 228 directly in front of the rear upwardlyrunning stretch of the belt. It will be seen that in order to place thebelt it is only Inecessary to ass one end through the opening 224 an'Hfeed it upwardly, when it will be engaged by the guides in successionand `pass properly around the several pulleys and guide rolls until itemerges again through the opening 224.

The arrangement of belting shown contains many valuable features.' Thevmain shaft 49 is at apoint as near the floor as pos- This 'has twoadvantages, namely, that vibrations are absorbed by the licor of theshop rather than b the bed of the machine and so are not a lowed toimpair the accuracy of the work; and-that it enables the longestpossible driving belt to be used from an overhead countershaft. Itis`well known to those skilled in the art that a long ,i belt gives morepower than a short one, andA this end is secured by .the distance of theshaft 49 from the iippercountershaft being the greatest possible. Thenthe disposition of thebelt 220 y:for driving' the wheel spindle enablesthe machines base to `be compact, while at the same time securing greatpower and enabling the slack to bertaken up. l This belt surroundsEapproximately half or more than half of the circumference of'bothpulleys 217 and 221, whence the tendency to sllpping is the minimum. Thedirection in which the taker-u roll 219 is adjustable being. aproximatey'parallel to the bight of `the be t` which surrounds it enablesthe stretch to vvbe taken up without altering the y relation .of thebelt to these two pulleys.

Beside the pulley 51 on the shaft 49 is a i small pulley 229 (Fig. 2)which drives the pump 200 by means `of a belt 230. The two stretches ofthis belt passy around two guide pulleys 231 and are deflected at rightangles, passing around a pulley 232 on the pump shaft which liesuapproximately at right angles to the shaft 49. vAlso on the shaft 49and besides the cone pulley 213 is another pulley ning over a pulley 234on the top ofthe post 2. Such ulley'is connected to 'a shaft having onearing' in` the post and another bearin in a" bracket 235 which isfastened at one si eof the base 1 and passes to a point above una 1n therear of the slide, such ,the work is accessible for measurement grindingwheel and about which passes `a belt 233 runbracket being partiallyshown in Fig. 1.

On the shaft isa drum 236 about which the grinding wheel is all on oneside of the latter.v and also that the dead center projects from thefoot stock a distance more than equal to the width of the grinding wheelface. Owing to these features, the slide can be moved to the left farenough to bring the entire length of the work clear of the grindingwheel, and thereby every point on with calipers. A feature alsotis thatthe grinding wheel is mounted close to the side of one ofthe bearingsforthe spindle, which bearings are large and massive, and are supportedupon a post ywhich is short and of powerful build. This mounting givesgreat rigidity and capability of absorbing vibrations, and is speciallyadapted to support a large and broad grinding wheel when the work is feddirectly up to it. From the fact that the space at -the side of thegrinding wheel toward the head-stock is entirelyr open. or in otherwords. that there are no obstructions which could interfere with thevrotation of the face plate and dog on the head stock.

clamps b v which it is main portion of the baseextend rearward ybeyond'the front of the post or standard 2. adjacent the inward side ofsaid post, and are positioned beneath the grinding wheel and bothforward and rearward of the axis thereof. This disposition 'of thebearing surfaces and ide ways beneath the both forward and rearward ofthe axis thereof gives increased stability to the cross-feed carriageand to the work-.holding slide mounted thereon. and firmly resists thedownward pressure of the wheelv on the work.

I' have made provision for reproducing with accuracy, work pieces havingshoulders. or having len hs of different diameters. so that thedistances between the shoulders. or such lengths, will becorrespondingly identical on all the pieces. This effect is secured by atemplet dog 240 shown in Fig. 14, which is adapted to be mounted uponthe `slide 13 to perform the functions of the dogs 115 and 116 inco-acting with the lever 97 'upon in diiferent Work This templet isadapted to be placed upon pins or analogous fastenings 241 (Fig. 1)rising from lues 242 which project from the front of the glide, and hasshoulders 243, any pair of which may embrace' the lever 9T andalternately swing the latter back and forth in reciprocation of theslide. One pair of such shoulders controlthe reciprocations of the slideWhile a certain part of the work is being done, and when this part Iiscompleted the slide is shifted until another pair 0f shoulders embracethe lever, the templet being temporarily removed from'fthe slide orlifted high enough to clear the lever while the shift is made. It isvery apparent that by the use of this templet absolute uniformity in thelengths of the part acted pieces may be secured. A different templet dogis naturally used for each particular pattern of Work. The manner ofmounting the templet on the slide is not of great importance, and may beother than. that described, provided only the templet is so mounted thatit Vmay be displaced out of the way ofthe dogs 115 and 116 when itis notused, and may also be so displaced as to permit shifting of the carriageto enable different parts of the templet to be operative.

I claim:

1. A grinding machine including in its construction a cross feedcarriage, a Work holding slide mounted on said carriage and movabletransversely to the feed of the latter, and mechanism for automatically7driving said slide, including a gear supported on a stationary part ofthe machine and having a length as great as the distance of feeding ofsaid carriage. a carriage in mesh .with and movable longitudinally ofsaid driving gear, and further gearing driven by the second named gearand connected with the work holder.

2. A machine of the character described comprising in combination agrinding wheel, a work-carrier movable across` the face of said grindingwheel, a stationary shaft mounted on the base of the machine, a drivingdisk rotatably mounted on said shaft, means for rotating said disk. adriven disk and a drum connected thereto both rotatably mounted on theshaft. mechanism actuated by said members for reciproca-ting the Workcarrier, transmission friction rolls supported by the shaft between saiddisks in contact therewith. and thrust bearings for said drivingelements and said drum, respectively, mounted detachably on the shaft.

3. A grinding machine including a grinding wheel, awork holding bedmovablev across the face of said wheel, means for reciprocating said bedincluding oppositely moving elements and a clutch for connecting eitherof said elements exclusively with the bed, an endwise movable rod forshiftlng gear mounted upon the` said clutch, a, hand lever engaged withsaid rod for moving the same; and a latch adapted to hold the clutch outof engagement with either driving element.

4. yAgrinding machine including ing wheel, a l work holdinor across theface of said wheel, means for reciprocating said bed including`oppositely moving elements and a-clutch for connecting either of saidelementsexclusively with the bed, an endwise movable rod for shiftingsaid clutch, a hand lever engaged With said rod for moving the same,having a projection on one side, and a latch pivotally mounted adjacentte said hand lever and having a notch adapted to receive saidprojection, the notch being solocated as to admit the projection whenthe hand lever is an intermediate position, and thereby hold the sameand the clutch in neutral condition.

5. A grinding machine including a. grindingv Wheel,` a Work holding bedmovable across the face of said wheel, means for reciprocating said bedincluding oppositely moving elements and a clutch for connecting eitherof said elements exclusively with the bed, anendwise movable rod forshifting said clutch, a hand lever engaged with said rod for moving thesame, having a projection, a latch member pivotally mounted adjacent tosaid hand lever and adapted to be placed so as to rest under the forceof gravity on the projection, said latch havin a notch so arranged as toslip over the said projection, gravity actuated, to arrest the lever andclutch in an intermediate position.

6. A grinding machine including a grinding wheel, a Work holding bedmovable across the face of said wheel, means for reciprocating said bedincludin oppositely movin 'elements and a clutch flor connecting eiterof said elements exclusively with the bed, an endwise movable rod forshifting said clutch, a hand lever engaged with said rod movablyadaptedy a grindbed movable mounted adjacent to said lever to bedisengaged therefrom and also to be placed in such position as toautomatically lock the same under the inuence of gravity -when the leverand clutch are in a neutral position.

v'i'. A grinding machine includin construction a ing bed mova le acrossthe face of said wheel, mechanism for reciprocating said bed comprisinga shaft geared to the bed,

in its oppositely rotating drivingtr elements loose with respect to suchsha a clutch between said elements ynon-rotatably engaged with the shaftand movable into connection with either element and simultaneously outof connection with the other, an endwise movable rod connected with saidclutch for shifting the latter, collars on said rod, a

for moving the same, and a latch rinding wheel,'a wor -carrybracketfixed on a part of the machine having a depending stud, a. lbell cranklever ivoted on said stud having an arm embraclng the rod and containedbetween said collars, a movable bar engaged with the other arm of saidbell crank lever, and means cont-rolled by the travel of said bedshifting the bar back and forth. Y 8. A grinding machine including incombination a grinding wheel, a work-carr ing bedmovable across the faceof said w reel, reversal driving mechanism for said bed includingareversing clutc-h and an endwise movable rod for operatinv said clutch,a lever operated 'automatica-l y by t-he movement of the bed for movingsaid rod; a hand lever for likewise moving the rod, and collars mountedon said rod and embracing those portions upon the rod, said collarsbeing adjustable so as to permit the respective levers to occupy certaindesired relations with one another.

9. A grinding machine including in combination with a grinding wheel anaiworkcarrying bed movable back and forth across the face of said wheel,driving mechanism including a. shifting reversing clutch for moving saidbed back and forth, an endwise movable rod coupled to` said shifting thesame, a rod, a bracket fastened to aV para. of downwardly therefrom, thelever being pivoted to the stud below the bracket, and means forswinging said lever back and forth at the ends of the reciprocation ofthe bed.

10. A grinding machine including in its construction the combinationwith a grinding wheel, of a work carrying bed movableback and forthacross the face of the Work, oppositely rotating drivers, mechanismincluding a clutch for alternately couplingone of said drivers to thebed and simultaneously cutting theother therefrom, a clutch actuatingbar movable by the bed through distances Vgreater than the travel of theclutch, means for coupling the clutch with the bar'having provisions forlost motion, means whereby the bed in each direction of travel initiatesmovement of the bar ,through :1n-amount equal motion, and automaticmeans for continuing the motion of the bar through a farther distanceapproximately equal to the distance necessary yfor complete shifting ofthe clutch.

11. The combination in a grinding machine with a grinding wheel and aworkcarryingbed, of mechanism including a shiftable clutch for drivingsaid bed back and forth, a clutch operating bar having a lost motionconnection with the clutch and having also a V cam, a yielding actuatoren- `tion of said base of said levers ,which operate clutch for, leverengaged with saidv the machine, a stud secured to said bracket' andprojecting for reciprocatingthe approximately to such lostr 4gaged withsaid cam andv adapted bypress-l mg on a face of the cam to-lmove thebar, the longitudinal extent-of which face of said 'cam beingsubstantially equal tothe amount of the aforesaid ,lostmotion and to thetotal movement of the clutch and clogging mec-hanism operated -by thebed for moving said bar at the conclusionof each trip of the bed. 12. Agrinding machine comprising a base having' a main portion 4and having a'post lived to the rear part of said main lportion of said baseandrising above said base at one side of the center thereof, a grindingwheel rotatably carried by said postat the sidel toward the center ofsaid base andvover said main portion riage supported and' guided on themain porfor forward and rearward movement transversely to the axis ofthe grindin wheel, said carriage being supported on said mainportion'rearward beyond the front of said post and adjacent-the side ofsaid post and beneath said grinding wheel and both forward and rearwardof the axisthereof, means to move said carriagel forward and rearwardsupporting slide mounted to reciprocate on said carriage in front ofsaid post and in a direction substantially parallel to the axis of saidwheel, and means'to reciprocatesaid slide.

13. A grinding machine comprising a base, a post risin above said baseat one end thereof, a grin ing 4wheel rotatably carried "by said post atthe inward side thereof, a be movably mounted on the base, work holdersthe head stock being on the opposite side of the grinding wheel from theost, -and av work supporting centercarried liy the foot stock andprojecting therefrom a distance ing wheel face. s

14. In a inding machine `the combination with a grinding heel of 'ayreciprocable work-carrying bed, I bed and a clutch shifter operated bysaid dogs for effecting reversence of the movement of the bed, a handoperated mechanism bed, and means for {ixing Said lever rigidly in astationary position whereby it may serve in conjunction with said dogsto gage the movements of the bed when the latter is manuallyreciprocate'd. 15. In combination -with the grinding wheel of a indingmachine and the reciprocating wor -carrying bed thereof, a clutchshifting member for the bed, anda templet dog carried'by said bed,said'dog having shoulders at a definitedistance apart adapted to embracesaid' clutch-shifting member and move the latter back and forth.

16. In combination wheel of a grinding machine and the reciprothereofacross feed car- Greater than the width of the grindon said base, a workfycomprising `a head stock and a foot stock on 'the.bed, and

`dogs mounted upon said with the grindingY cating work-carr shiftingmember the carriage, aplurality of adjustable fingers carried by saidfeed member, and a complemental stop for each of said lingers, each saidstop being displaceablc from the path of its respective linger wherebyto permit such finger to pass it without interference.

18. A grinding 4machine combination a grinding wheel, a work-holdingcarriage movable toward and from the wheel, a rotating feed member forso moving the carriage, a set of stop fingers carried b v said feedmember and each independently adjustable in the direction of ymovementof said member, a stop for each of said fingers pivotally mounted withprovision for independent movement., an abutment for said stop wherebythe same is held immovably in the path of th'e corresponding feedfinger,

v the stop being movable about its pivot ont of the path of thecorresponding finger. j

19. A grindlng machine 'comprising 1n combination a grinding wheel, awork-holdlacs ing carriage movable toward and from the wheel, a rotatingfee'd member for so moving the carriage, and a `plurality ofcomplemental stop members carried by said feed member and normallystationary, one member of each of such ently of the others from the pathof the complemental member, a graduated disk carried by the feed memberand an index cooperating with said disk.

20. In a machine of the character described having a cross feedcarriage, a cross feed screw, and means for turning said screw, stopfingers adjustably mounted uponsaid screw and each independentlyadjustable around the same, a stud independent of said feed screw, stopspivotedon sa-id stud each in the path of one of said fingers, and anabutment for said stops to sustain them against the thrust of saidfingers, the stops being adapted to swing over and away fromsaid'abutment and out of the paths of their respective fingers. y

21. In a combination of the character described having a cross feedcarriage and a cross feed screw, bearing disks keyed upon said screw,combined sto' fingers and clamps surrounding said bearings independentlyand each having a clamping device for tightening it upon its bearing,and complemental displaceable stops for the several fingers.

22. In a combination'of the character decomprising in pairs beingdisplaceable independ-Y' plate, said channels being feed carriage and a`mental displaceable stops for the several fingers, a graduated diskfixed to the feed screw and a finger adjacent to the graduation of saiddisk whereby to regulate the setting of said fingers.

23. In a grinding tion with a longitudinally reciprocating bed having awater trough near one edge, a plate swiveled upon said bed havinglongitudinal guide ways for a work holder, said guide ways being cutaway adjacent to the ends of the plate, and water shields secured to theplate beside the cut away ends of said guide ways and having pockets orchannels arranged to discharge into said trough.

24. In a grinding machine the combination with a longitudinallyreciprocatingbed, of a work-holding plate mounted thereon having alongitudinal slot for securing a' work-holder, said bed having a troughat one side of the plate and having transverse channels opening intosaid trough and eX- tending under the plate, and the plate havingpassages leadlng through from said slot, whereby tov permit entering theslot.-

25. In a with a reciprocating bed of a work-holding plate mounted uponsaid bed and a work support on said plate, the bed having a trough atone side of the plate/to receive water and having transverse channelsextending backfrom said trough under the discontinuous, and ends-of theplate, from the ends of shields overlapping the whereby escape of waterthe bed is prevented. i

26. A grinding machine comprising in combination a base, a work-carryingbed machine the combinar drainage'of water grinding machine thecombination mounted upon the top of said base, and having means for su iportinfr the work piece said bed having b a so a water trough at itsArear edge, a pan detachably mounted on the top ofthe base in rear ofsaid bed having a ortion below the outlet of said trough an having alsoanother outlet.

27. A grinding machine comprising in combination a base, a ed at the topand front a lon itudinally movable Work bed on said slide aving a watertrough along its rear edge, a water tank at the rear of said base, and apan detachably mounted on the top of the base having one edge beneaththe water trough and extending longitudinally of the bed sufficientlyfar to underlie the outlet from the trough in all positions of thelatter, said pan having an outlet also leading into said tank.

side of said base,

cross feed slide mountf 'cent to said spindle,

the column*` a 28. In a grinding machine consisting of a base havingan-,upright post at one corner, a grinding wheel supported on said post,a work-carrying bed Inova-bly mounted upon the forward portions of thebase in front of the grinding wheel. `said bed having a water-conductingtrough, and a pan detachably1 mounted on the topl of the base beneathand to the rear of the bed and having an extension passing between thebed and the post. for collecting and conducting away water dischargedfrom the trough.

29. In a grinding machine, a box-like stable base having an L-shapedrear extension adjacent to one side thereof, said extension being of boxformation and rising above the top of the other part of the base, toconstitute a column, the major part of the base being adapted to.support a work holding carriage, a grinder wheel holder secured to saidcolumn above the base, a grinder wheel spindle mounted in said holderand crossing the forward side of the column` the front wall of thecolumn being open adjadrivingr shafts mounted rotatablyv in said columnadjacent to the upper and lower ends thereof respectively, a drivingbelt operatively engaged with the lower of said shafts, a transmissionbelt simultaneously engaged with both shafts, a pulley mounted on theupper shaft within belt passing around said pulley and also around thegrinder spindle, and guide pulleys mounted within the column for saidbelt arranged to cause the belt to surround more than half thecircumference of both the pulley and the spindle, and one of said guidepulleys further disposed to guide the belt in a bight extending betweenthe pulley and the spindle with the opposite sides of such bightapproximately parallel, the last-named pulley being adjustable inapproximately the direction in which such bight extends to take up slackand regulate the tension of said belt.

30. A grinding machine 'including in its construction a post, a pulleyin said ost, means for driving the pulley, a grin ing wheel spindlepulley su ported at the Aside of the first named pu ey, guide pulleyswithin the post arranged to conduct a driving belt around and betweensaid pulle s, and

ribs within the post extending near t e several stretches of such beltand arrange-d to direct a belt around the pulleys in proper order whensuch belt is fed into the post. 31.` In a grinding machine a casing,ing, driven, and Guide pulleys in said casing out of regular tllinement,and guiding ribs within the casing extending between points nearsuccessive pulleys, ,whereby to guide a belt fed endwise into the casingto and around the pulleys in predetermined order. 32. In a grindingmachine in combination with a reciprocating work-carrying bed, avariable speed reversible mechanism for driving said bed, means foractuating the speed varying elements of said -mechanism including a rodconnected to a clutch mechanism, an upright shaft having an arm linkedto said rod, a handle on said shaft g for turning the same, a fixedplate throu h which said shaft extends and a latch e ement connectedwith said handle for llocking the shaft Ain various positions incooperation with said plate.

33. A grinding machine comprising a base having a main portion andhaving a post fixed to the rear part of said main rtion of said base andrising above said ase at one side of the center thereof, a grindingwheel rotatably carried by said post at the side toward the center ofsaid base and over said main portion thereof, a cross-feed carriagesupported and guided on the main portion 'of said base for forward andrearward movement transversely to the axis of the grinding wheel, saidcarriage being supported on said main portion rearward beyond the frontof said post and adjacent the side of said post and beneath saidgrinding wheel and both forward and rearward of the axis thereof, meansto move said carriage forward and rearward on said base, awork-supporting slide mounted to reciprocate on said carriage in frontof said t andA in a direction substantially paralle to the axis of saidwheel, and means to reci rocate said slide, said slide having a wordridvn head stock mounted thereon at that en o side of said grindingwheel from said post.

In testimony whereof I have hereunto aixed my signature;

JOHN BATH.

drivsaid slide which is on the opposite

